Their crystallinity is very high and their polytype is 2M_1.Both of them are dioctahedral because the d_(060) and b of micro-crystal muscovite and phengite are 0.1502 nm,0.9012 nm and 0.1505 nm,0.9030 nm,respectively.
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美
- 二者都属二八面体型白云母类矿物;但d060和b值偏大;微晶白云母的d060=0.;1502 nm;b=0